Improvement in furnaces for manufacturing oxide of zinc



, 2 Sheets-Sheet I. WHARTON & BARTLETT.

Making White Zinc.

Patented July 13, 1858.

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. N 10.20.926; Patemedluly 13, 1858.

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UNITED STATES PATENT OFFICE.

J. VHARTON, OF PHILADELPHIA, AND N. BARTLETT, OF BETHLEHEM, PENNSYLVANIA, ASSIGNORS TO JOSEPH VHARTON.

IMPROVEMENT lN FURNACES FOR MANUFACTURING OXIDE 0F ZINC.'

Specification forming part of Letters Patent No. 20,926, dated July 13, 1658.

To all whom, it may concern.-

Be it known that we, JOSEPH VHARTON, of the city of Philadelphia and State of Pennsylvania, and NATHAN BARTLETT, of Bethlehem, in the same State, have invented a new and useful Improvement ,in the Construction of Furnaces for the Manufacture of White OX- ide of Zinc; and we do hereby declare the following to be a full and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l represents a ground plan of our improved furnace; Fig.,2, an elevation in the front on line A B of Fig. l; Fig. 3, a vertical transverse section on the line X Y.

Our improvement consists in an improved arrangement and construction of furnaces for the manufacture of white oxide of zinc for the purpose of attaining an increased economy in the process and .purity in the results.

A B C D represent a ground plan of a series of three furnaces.

A B E F represent a front view of the three furnaces.

G H I K is a vertical section through one of the three furnaces, and corresponds with each of the other two.

Instead of constructing the furnaces double and placing an end wall between them at the line a a', Fig. 8, as heretofore,we construct our furnaces in one length, extending from the charging-door b to the charging-door b. Thus each furnace is about double the length of the ordinary furnace, and has a charging-door, b or b', at each end of it. Through both the door b and the door b the fuel and ore are charged into each of the furnaces. By this arrangement a partition-wall at a a is avoided and a great waste of fuel in heating this dead-wall, and the destruction of material by the formation of clinkers against this end wall is avoided. W'hen the furnace is to be cleaned, two men are stationed one at each end of the furnace at the doors b and b', and they work the ends of their clinking-brs toward each other, cleaning out the furnace more completely and readily. Ve have found that by this combination of the furnace a great saving of fuel and labor is effected.

Three or more such furnaces as above de` scribed are built side by side, as shown in the drawings, Figs. l and 2.

b, b2, and bL represent the charging-doors at one end of each furnace. A11 arch or flue, L L, is built transversely across the top of these three or more furnaces, and serves as a common conduit for the products of combustion of all the furnaces when fully at work. Each furnace opens into this common flue LL by an aperture, C, in the top arch of each of the furnaces. Each of these apertures C is closed by a sliding damper, d, moved by a stem, d. The intention of this damper is to close the aperture O at the commencement of the combustion in the furnaces, when impure products composed principally of ashes and useless gases would pass 0H'. At such times adamper, e, is opened by arod, e', by which all these useless and impure products escape or are drawn off through the small chimneys g gf g", one of which opens into the top of each furnace near one extremity. As

soon as the impure products cease to escape and the oxide of zinc begins to formfreely, the valve e is closed, and the valve or damper d is opened, and all the products from the three furnaces then pass into the common conduit L L', and thence are conducted into any proper apparatus for separating the solid impurities and collecting the oxide of zinc.

Ve also construct a water-bottom, h h, by making the ash-pit water-tight by lining it with cement. This is kept supplied with water by a hose or pipe through the ash-pit door. The heat of the furnace evaporates the wat-er slowly, and this protects the lower surface of the grate-bars, and the steam evolved promotes the combustion ofthe fuel within the furnaces.

K K Kl K are a series of air-pipes vor tuyeres leading from the blower and opening just above the bottom of the arch LL-one to each furnace. They are so arranged as to direct their` blast across the apertures CCC,and in the direction of the axis of the conduit toward its point of discharge. The advantage of these tuyeres is by their blast to oXidize fully any vapor of zinc, also any sulphur evolved from the charge duringthe process of combustion.

Having thus described our improved furnace,what We desire to claim as our invention, ner and for the purposes substantially as above and secure by Letters Patent, isset forth.

1. The construction and arrangement of the 3. The series of tuyeres la kk, opening into the furnaces of double the usual length Without conduit L L7 arranged and operating as above any separating end Wall7 and with a charging described.

door at each extremity, in the manner and for JOSEPH WHARTON. the purposes above set forth. NATHAN BARTLETT.

2. The construction and combined arrange- Vitnesses: ment of the conduit L L7 the dainpers or valves J. H. B. JENKINs, d and e', and the chimneys g r/ g, in the man- CHARLES D.I FREEMAN. 

